• Korean Journal of Social Welfare
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• v.63 no.2
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• pp.133-154
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• 2011

This study aimed to examine the relationship between the expectation of independent life in old age and intergenerational downward transfer of Korean old people. It was focused on old people who did not live with their adult children by using the raw data of "2008 the Korean study of Welfare Services for the Elderly". The data were analysed by multiple regression analysis. The results showed the degree of the expectation of independent life in old age had positive effect on economic and service downward transfer of old people. Concretely, the degree of the expectation of economic and physical independence had positive effect on economic and service downward transfer of old people. The degree of the expectation of emotional independence had positive effect on service downward transfer of old people, while it had no effect on economic downward transfer.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.8C
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• pp.819-827
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• 2002

Personal mobile communication has been developed up to IMT-2000 which is called the third generation mobile communication. The first generation of personal mobile communication was analog cellular, the second was digital cellular, and the 2.5 generation was PCS. Before the third generation had been developed, the personal mobile communication service was focused mainly on the voice-oriented service. But, we can expect that multimedia service after the third generation system will be the core of the subject. T In this thesis, we propose a dynamic resource allocation algorithm in the UTRA TDD systems which can support the asymmetric traffic propensity and multimedia traffic. The proposed algorithm consists two sub-algorithms. One is the dynamic channel allocation method that determines the amount of bandwidth assigned between uplink and downlink according to resource allocation status list through asymmetric traffic propensity. The other is the channel access mechanism that assigns RU to bearer service generated in a cell. By simulation, the proposed dynamic resource allocation algorithm is proved to support asymmetric propensity of traffic and shows a better throughput for multimedia traffic.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.301-302
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• 2015

케이블 방송망에서 멀티-Gbps(Giga bit per second) 초고속 인터넷 서비스 제공을 위해 최근 북미에서 DOCSIS 3.1(Data over Cable Service Interface Specifications Version 3.1) 표준을 발표하였다. DOCSIS 3.1 은 최대 10Gbps 하향 데이터 전송과 최대 2Gbps 의 상향 데이터 전송을 목표로 한다. DOCSIS 3.1 이 이전 DOCSIS 표준들과 다른 점은 전송 효율을 높이기 위해 물리계층 전송 방식에 큰 변화를 주었다는 점이다. 기존 6MHz 대역폭의 단일 반송파 전송 방식에서 최대 192MHz 광역 채널의 다중 반송파 전송 방식으로 변경하였다. 또한 채널 오류정정 방식으로 BCH(Bose, Chaudhuri, and Hocquenghem)와 LDPC(Low Density Parity Check) 연접부호를 적용하여, 이로 인한 SNR 성능 이득 통해 4096-QAM 의 고차 변조를 지원한다. 본 논문에서는 최대 192MHz 의 광역 채널로 전송되는 약 2Gbps 의 전송 데이터에 대한 채널 오류 정정을 위해 고속의 LDPC 복호기 구현 방법을 제시한다.